Posted by Reg on 5/10/2008, 9:33 am, in reply to "Re: The problem with iron"
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Hi Rick,
On the GS 5, there is a control called the delay. This is sort of like a disc control also. If the delay is set at minimum, then you will detect the smaller gold and foil. If this control is advanced, some gold and foil are ignored.
So, in answer to your question, you could adjust the delay to eliminate thin foil while detecting some small gold. Just what size gold would be ignored and what would be detected is difficult to say.
I deliberately didn't discuss this point because it does add another level of confusion to those unfamiliar to the PI. It will make more sense to those who have used a PI before.
So, as a long winded answer to your question, yes, there is a technique that can be used to minimize or eliminate foil signals and detect more of the small gold.
On the down side, when using this feature, then all ferrous objects will be detected also, depending upon the GB setting. Some will cause a high tone and others will cause a low tone or a dual break type tone.
BTW, you do not have to turn the GB off to adjust the delay.
Ok, to confuse things but to also try to answer your question about eliminating ferrous objects while adjusting out foil, you could adjust the delay to reduce the foil signal and adjust the GB to the point that most ferrous objects create a low tone. Unfortunately, when the GB is adjusted far enough, ferrous objects have a tendency to generate both a high and low tone. This iron signal is more of a stutter or double blip common to what one hears coming from a nail when checking an object using the all metal mode of a VLF. So, you could do it all without changing settings but it would take some interpretation on the part of the operator.
Now, you are correct, one could use your technique of testing for one and then the other to try to find smaller gold and separate it from much of the foil and still minimize the iron problem. This is a different technique than what I just mentioned. This technique will also take some serious practice to get the best results.
One last note, you are also correct about the GB and depth loss. With the GB off, you do get greater depth.
To all of you who have never used a PI, this post is really going to be confusing. I apologize for that. It is meant more for those who have more experience with a PI.
Hopefully, once the Whites is out and if it works as I hope, I am sure there will be more discussions about the best procedures that can be used. Right now, discussing some of these techniques really confuses things to those who have never used this type of PI, which is why I have not discussed them earlier.
The bottom line is there are more techniques that could be used on the GS 5 that haven't been discussed. These features and techniques should be available on the Whites PI also.
These features will allow for a lot of things to be done by the experienced operator that a novice may not want to try at first. It also further explains that the PI is not for everyone. There is a lot more complexity than a person realizes to a PI.
Reg
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